Active material, electrode, secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2023299278-A1
Application number	US-202217823699-A
Country	US
Kind code	A1
Filing date	Aug 31, 2022
Priority date	Mar 15, 2022
Publication date	Sep 21, 2023
Grant date	—

Abstract

In general, according to one embodiment, an active material including particles containing a niobium-containing oxide is provided. The particles containing the niobium-containing oxide contain single particles having protruded parts and recessed parts. Three or more of the recessed parts satisfy 0.1≤a/L≤0.5 (1). Where L is a length of a tangent line in contact with a first protruded part and a second protruded part, and a is a maximum length of a perpendicular line from the tangent line to a recessed part defined by the first protruded part and the second protruded part.

First claim

What is claimed is:

1 . An active material comprising particles containing a niobium-containing oxide,
wherein: the particles containing the niobium-containing oxide comprises a single particle having protruded parts and recessed parts; and three or more of the recessed parts satisfying the following formula (1):
0.1≤ a/L≤ 0.5  (1)

wherein L is a length of a tangent line in contact with a first protruded part and a second protruded part; and a is a maximum length of a perpendicular line from the tangent line to a recessed part defined by the first protruded part and the second protruded part.

2 . The active material according to claim 1 , wherein the particles containing the niobium-containing oxide have an average particle size (D50) in a range of 0.5 μm to 6 μm.

3 . The active material according to claim 1 , wherein a content of the particles containing the niobium-containing oxide is in a range of 75% by weight to 100% by weight.

4 . The active material according to claim 1 , wherein the niobium-containing oxide contains at least one crystal phase selected from the group consisting of Nb 2 TiO 7 , Nb 2 Ti 2 O 9 , Nb 10 Ti 2 O 29 , Nb 14 TiO 37 , and Nb 24 TiO 62 .

5 . The active material according to claim 1 , wherein the niobium-containing oxide is a monoclinic niobium-titanium composite oxide.

6 . The active material according to claim 1 , further comprising at least one selected from the group consisting of lithium titanate having a ramsdellite structure, lithium titanate having a spinel structure, monoclinic titanium dioxide, anatase titanium dioxide, rutile titanium dioxide, a hollandite titanium composite oxide, and an orthorhombic titanium-containing composite oxide.

7 . An electrode comprising the active material according to claim 1 .

8 . The electrode according to claim 7 , which satisfies the following formula (2):
0.01≤ n/N≤ 0.5  (2)
wherein: N is a total number of particles in a 20 μm-square region of a surface of the electrode; and n is a number of single particles in the 20 μm-square region.

9 . The electrode according to claim 7 , wherein the electrode has an electrode density in a range of 2.3 g/cm 3 to 3 g/cm 3 .

10 . A secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, wherein
the positive electrode or the negative electrode is the electrode according to claim 7 .

11 . A battery pack comprising the secondary battery according to claim 10 .

12 . The battery pack according to claim 11 , further comprising:
an external power distribution terminal; and a protective circuit.

13 . The battery pack according to claim 11 ,
wherein: the battery pack includes a plurality of the secondary battery; and the secondary batteries are electrically connected in series, in parallel, or in a combination of series and parallel.

14 . A vehicle comprising the battery pack according to claim 11 .

15 . The vehicle according to claim 14 , further comprising a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Yamashita Yasunobu
• Yoshida Yorikazu
• Ueda Kakuya
• Takami Norio

Classifications

• C01G33/00 Primary

  Compounds of niobium · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2002/60

  Compounds characterised by their crystallite size · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title